<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>百分比布局</title>
    <script src="./flexible.js"></script>
    <style>
        .box {
            width: 10%;
            height: 10%;
        }
    </style>
</head>
<body>
    <div class=".box"></div>
</body>
</html>